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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
All ions are atoms. When the number of protons and electrons in an atom match, the charge is neutral. When there is an imbalance, the atom is an ion. Hydrogen typically has a â¦ charge of +1, whereas oxygen typically has a charge of -2. Oxygen therefore readily combines with two hydrogen atoms forming H2O, or water.